1 #ifndef _ASM_X86_PAGE_32_DEFS_H 2 #define _ASM_X86_PAGE_32_DEFS_H 3 4 #include <linux/const.h> 5 6 /* 7 * This handles the memory map. 8 * 9 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has 10 * a virtual address space of one gigabyte, which limits the 11 * amount of physical memory you can use to about 950MB. 12 * 13 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G 14 * and CONFIG_HIGHMEM64G options in the kernel configuration. 15 */ 16 #define __PAGE_OFFSET_BASE _AC(CONFIG_PAGE_OFFSET, UL) 17 #define __PAGE_OFFSET __PAGE_OFFSET_BASE 18 19 #define __START_KERNEL_map __PAGE_OFFSET 20 21 #define THREAD_SIZE_ORDER 1 22 #define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) 23 24 #define DOUBLEFAULT_STACK 1 25 #define NMI_STACK 0 26 #define DEBUG_STACK 0 27 #define MCE_STACK 0 28 #define N_EXCEPTION_STACKS 1 29 30 #ifdef CONFIG_X86_PAE 31 /* 44=32+12, the limit we can fit into an unsigned long pfn */ 32 #define __PHYSICAL_MASK_SHIFT 44 33 #define __VIRTUAL_MASK_SHIFT 32 34 35 #else /* !CONFIG_X86_PAE */ 36 #define __PHYSICAL_MASK_SHIFT 32 37 #define __VIRTUAL_MASK_SHIFT 32 38 #endif /* CONFIG_X86_PAE */ 39 40 /* 41 * Kernel image size is limited to 512 MB (see in arch/x86/kernel/head_32.S) 42 */ 43 #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024) 44 45 #ifndef __ASSEMBLY__ 46 47 /* 48 * This much address space is reserved for vmalloc() and iomap() 49 * as well as fixmap mappings. 50 */ 51 extern unsigned int __VMALLOC_RESERVE; 52 extern int sysctl_legacy_va_layout; 53 54 extern void find_low_pfn_range(void); 55 extern void setup_bootmem_allocator(void); 56 57 #endif /* !__ASSEMBLY__ */ 58 59 #endif /* _ASM_X86_PAGE_32_DEFS_H */ 60